SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b658b81193d89fe4e3766442c9ab328dbbaa9cab049df5762133088599e788a' 
  AND token = 'iRBvI+Lu6M/8+hWcgzDdY7FAOB2IELXBRL3kvE+ZZw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}